EXPLANATION OF PLATE 17 



Fig. 1 Lithostrotion microstyhim White ; plesiotype ; X 1 p. 53 



Portion of surface ; University of Missouri No. 1357. 

 Fig. 2 Pleurodictyum expansum (White) ; holotype ; X 1 p. 55 



Portion of surface ; University of Chicago No. 6687. 

 Fig. 3 Favosites divergens White and Whitfield ; holotype ; X 1 p. 54 



Exterior of corallum ; American Museum of Natural History No. 6363/1. 

 Figs. 4, 5 Chdochonus striatus Easton, n. sp. ; X 1 p. 62 



4, Crinoid stem plate surrounded by four corallites ; paratype ; University of Chicago 

 No. 9769. 



5, Portion of free frond showing striate surface ; holotype ; University of Chicago 

 No. 9678. 



Figs. 6, 7 Triplophyllites ida (Winchell) emend. Easton; X 1 p. 41 



.(5, Exterior of large specimen; holotype; University of Michigan No. 5396. 



7, Calyx of small, very young specimen ; original figured specimens of Z. exigua Miller ; 

 University of Cincinnati No. 7391. 



Figs. 8, 9 Cleistopora procera (Rowley)?; plesiotype; X 1; University of Chicago No. 9765 p. 58 



8, Lower surface. 



9, Upper surface. 



Fig. 10 Koninckophylliim glabrum (Keyes) ; plesiotype; X 1 P- 51 



External view showing abrupt constrictions ; University of Missouri No. 7209. 



Fig. 11 Auloporaf sp.; Xl ^ P- 62 



Two corallites separated from attached object ; University of Chicago No. 47246. 



Fig. 12 Vesiculophyllum sedaliense (White); plesiotype; X 1 p. 52 



Exterior of rather small conical specimen ; University of Missouri No. 359. 



Figs. 13, 14 Genus and species unidentified; X 1 ; University of Chicago No. 31591 . . . . p. 48 



13, Calyx. 



14, Side view. 



Fig. 15 Amplexus rockfordensis Miller and Gurley ; holotype ; X 1 ••••■■•• P- 48 



Side view showing prominent spines ; University of Chicago No. 6338. 

 Figs. 16-18 Triplophyllum terebratum (Hall); Xl P- 38 



16, Calyx, topotype ; American Museum of Natural History No. 4094/1. 



17, Calyx. 



18, View obliquely down into calyx ; holotype ; New York State Museum No. 3841/1 ; pho- 

 tographs by New York State Museum. 



93 



